/*
 * Copyright (c) 2012 Robert Burrell Donkin robertburrelldonkin.name
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
 * and associated documentation files (the "Software"), to deal in the Software without restriction, 
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or 
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */
package sekhmet.audio.format;

import java.io.IOException;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.TargetDataLine;

import sekhmet.audio.data.AudioData;

class LineReader extends BufferingReader implements AudioReader {

	private final TargetDataLine line;
	
	public LineReader(TargetDataLine line) {
		super();
		this.line = line;
	}

	public AudioReader close() {
		line.close();
		return this;
	}

	public AudioReader  open()  {
		if (!line.isOpen()) {
			try {
				line.open();
			} catch (LineUnavailableException e) {
				e.printStackTrace();
				throw new RuntimeException(e);
			}
		}
		return this;
	}


	public AudioReader start() {
		if (!line.isActive()) {
			line.start();
		}
		return this;
	}
	
	public AudioData read() throws IOException {
		final int requestedBufferSize = line.getBufferSize();
		final AudioFormat format = line.getFormat();
		final long startFrame = line.getLongFramePosition();
		
		
		final int bufferSize = Math.min(line.getBufferSize(), requestedBufferSize);
		final byte[] bytes = new byte[bufferSize];
		int numberOfBytesRead = line.read(bytes, 0, bufferSize);
		while (numberOfBytesRead == 0) {
			numberOfBytesRead = line.read(bytes, 0, bufferSize);
		}
		
		return build(format, startFrame, bytes, numberOfBytesRead);
	}

}
